Hi Jon: One thing to check on would be how are on/off functions handled. Some systems require a servo be modified to activate switch(es) for simple on/off while others have a switch function module that give 12 on/off on one channel. Just a thought.

Skip also sells a BEC: from his website-"BE/VR (Battery Eliminator/Voltage Regulator) can be used to power the receiver and servos directly from the main battery, eliminating the need for a separate receiver battery. Eliminates the headache of having an extra battery to charge as well as wondering if the receiver battery will last as long as the drive battery. Also great for any application that requires a fixed 5 volt output. Small size (1 1/2" x 1/2" x 1/2") allows you to mount BE/VR virtually anywhere.Can be used with any battery rated at least 6 volts."

cost is $16. As Doug has stated, this will take care if all your battery needs from the receiver side.